<template>
  <div class="add-role">
    <header class="add-header">
      <div class="left">
        <span class="arrow" @click="$router.back()"><i class="el-icon-arrow-left" />返回</span>
        <span>|</span>
        <span>添加角色</span>
      </div>
      <div class="right">
        黑马程序员
      </div>
    </header>
    <main class="add-main">
      <div class="step-container">
        <el-steps direction="vertical" :active="activeStep">
          <el-step title="角色信息" />
          <el-step title="权限信息" />
          <el-step title="检查并完成" />
        </el-steps>
      </div>
      <div v-show="activeStep===1" class="form-container">
        <div class="title">角色信息</div>
        <div class="form">
          <el-form ref="roleForm" class="form-box" :model="roleForm" :rules="roleRules" label-width="100px">
            <el-form-item label="角色名称" prop="roleName">
              <el-input v-model="roleForm.roleName" />
            </el-form-item>
            <el-form-item label="角色描述">
              <el-input v-model="roleForm.remark" />
            </el-form-item>
          </el-form>
        </div>
      </div>
      <div v-show="activeStep===2" class="form-container">
        <div class="title">权限配置</div>
        <div class="form">
          <template>
            <div class="tree-wrapper">
              <div v-for="item in treeList" :key="item.id" class="tree-item">
                <div class="tree-title">{{ item.title }}</div>
                <el-tree
                  ref="tree"
                  :data="item.children"
                  show-checkbox
                  default-expand-all
                  node-key="id"
                  highlight-current
                  :props="{ label: 'title' }"
                />
              </div>
            </div>
          </template>
        </div>
      </div>
      <div v-show="activeStep===3" class="form-container">
        <div class="title">检查并完成</div>
        <div class="form">
          <div class="info">
            <div class="form-item">角色名称：{{ roleForm.roleName }}</div>
            <div class="form-item">角色描述：{{ roleForm.remark }}</div>
            <div class="form-item">角色权限：</div>
            <div class="tree-wrapper">
              <div v-for="item in diabledTree" :key="item.id" class="tree-item">
                <div class="tree-title">{{ item.title }}</div>
                <el-tree
                  ref="diabledTree"
                  :data="item.children"
                  show-checkbox
                  default-expand-all
                  node-key="id"
                  :highlight-current="false"
                  :props="{ label: 'title'}"
                />
              </div>
            </div>
          </div>
        </div>
      </div>
    </main>
    <footer class="add-footer">
      <div class="btn-container">
        <!-- 上一步:大于1显示、下一步：小于3显示, -->
        <el-button v-if="activeStep>1" @click="decreseStep">上一步</el-button>
        <el-button v-if="activeStep<3" type="primary" @click="increseStep">下一步</el-button>
        <el-button v-if="activeStep===3" type="primary" @click="submit">确认添加</el-button>
      </div>
    </footer>
  </div>
</template>

<script>
import { getTreeListAPI, createRoleUserAPI, getRoleDetailAPI, updateRoleAPI } from '@/api/system-role'
// 处理禁用
import { addDisable } from '@/utils/index'
export default {
  data() {
    return {
      activeStep: 1,
      roleForm: {
        roleName: '',
        remark: ''

      },
      roleRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' }
        ]
      },
      treeList: [], // 权限树形列表
      diabledTree: [] // 数据回显树形
    }
  },
  // 缓存roleId
  computed: {
    roleId() {
      return this.$route.params.id
    }
  },
  async mounted() {
    // 在初始化时候就加载好
    this.getTreeList()
    // 如果是编辑状态，就回填数据
    if (this.$route.params.id) {
      this.selectRole()
    }
  },
  methods: {
    // 点击编辑时的回填数据
    async selectRole() {
      const res = await getRoleDetailAPI(this.roleId)
      const { perms, remark, roleId, roleName } = res.data
      // 回填表单数据
      this.roleForm = {
        roleName,
        remark,
        perms,
        roleId
      }
      // 回填树
      this.$refs.tree.forEach((item, index) => {
        item.setCheckedKeys(this.roleForm.perms[index])
      })
    },
    // 上一步
    decreseStep() {
      if (this.activeStep === 1) return
      this.activeStep--
    },
    // 下一步
    increseStep() {
      if (this.activeStep === 3) return
      if (this.activeStep === 1) {
        // 当前是角色信息状态，进行表单校验
        this.$refs.roleForm.validate(async valid => {
          if (valid) {
            // 校验通过才能进入下一个状态
            this.activeStep++
          }
        })
      } else if (this.activeStep === 2) {
        this.roleForm.perms = [] // 定义一个空数组用于保存选中的权限点
        this.$refs.tree.forEach(element => { // 遍历树形结构，将选中的权限点保存到roleForm.perms中
          this.roleForm.perms.push(element.getCheckedKeys())
        })
        // 如果长度为零 没有选中任何东西
        if (this.roleForm.perms.flat().length === 0) {
          this.$message.error('请至少选择一个权限点')
        } else {
          // 进入下一页
          this.activeStep++
          //   回填数据
          this.$refs.diabledTree.forEach((element, index) => {
            element.setCheckedKeys(this.roleForm.perms[index])
          })
        }
      }
    },
    // 获取权限树形结构数据
    async getTreeList() {
      const res = await getTreeListAPI()
      //   console.log(res)
      this.treeList = res.data
      //   this.diabledTree = res.data
      this.diabledTree = JSON.parse(JSON.stringify(res.data)) // 分开管理数据(引用类型 一个地方发生变化另一个地方也变 - 需要深拷贝)
      //   处理禁用
      addDisable(this.diabledTree)
    },
    // 确认添加
    async submit() {
      // 如果是编辑状态
      if (this.$route.params.id) {
        await updateRoleAPI(this.roleForm)
        this.$message.success('修改成功')
      } else {
        await createRoleUserAPI(this.roleForm)
        // 提示用户
        this.$message.success('添加成功')
      }
      // 返回上一级
      this.$router.back()
    }
  }

}
</script>
  <style scoped lang="scss">
  .add-role {
    background-color: #f4f6f8;
    height: 100vh;

    .add-header {
      display: flex;
      justify-content: space-between;
      padding: 0 20px;
      height: 64px;
      line-height: 64px;
      font-size: 16px;
      font-weight: bold;
      background-color: #fff;

      .left {
        span {
          margin-right: 4px;
        }

        .arrow {
          cursor: pointer;
        }
      }

      .right {
        text-align: right;
      }
    }

    .add-main {
      position: fixed;
      top: 64px;
      bottom: 88px;
      width: 100%;
      overflow-y: auto;
      background: #f4f6f8;
      padding: 20px 230px;
      display: flex;
      .step-container {
        height: 400px;
        width: 200px;
      }
      .form-container {
        flex:1;
        background-color: #fff;
        overflow-y: auto;
        .title {
          height: 60px;
          line-height: 60px;
          padding-left: 20px;
        }
        .form {
          margin-bottom: 20px;
          padding: 20px 65px 24px;
          .el-form {
            display: flex;
            flex-wrap: wrap;
          }
          .info{
            font-size:14px;
            color:#666;
            .form-item{
              margin-bottom:20px;
            }
          }
        }
        .form-box{
          width: 600px;
          display: flex;
          flex-direction: column;
        }
      }
    }

    .add-footer {
      position: fixed;
      bottom: 0;
      width: 100%;
      padding: 24px 50px;
      color: #000000d9;
      font-size: 14px;
      background: #fff;
      text-align: center;
      z-index: 10001;
    }
    .tree-wrapper {
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
        .tree-item {
          flex: 1;
          padding: 0px 4px;
          text-align: center;
          .tree-title {
            background: #f5f7fa;
            text-align: center;
            padding: 10px 0;
            margin-bottom: 12px;
          }
        }
      }
  }
  </style>
